Reverse Path Forwarding (RPF) is a fundamental check in multicast routing. It ensures that a router only accepts and forwards a multicast packet if the interface on which it arrived is the same interface the router would use to send unicast traffic back to the source of that packet.
If the packet arrives on any other interface, the router discards it. This prevents routing loops and duplicates in multicast forwarding.
RPF is to ensure that there are no loops in multicast traffic, the answer would require the packet to be dropped if it's received on the interface that is routed back to the source, so I believe the answer is D
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